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The Rossby Wave Extra Invariant in the Dynamics of 3-d Fluid Layers and the Generation of Zonal Jets : Volume 21, Issue 1 (10/01/2014)

By Balk, A. M.

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Book Id: WPLBN0003992452
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: The Rossby Wave Extra Invariant in the Dynamics of 3-d Fluid Layers and the Generation of Zonal Jets : Volume 21, Issue 1 (10/01/2014)  
Author: Balk, A. M.
Volume: Vol. 21, Issue 1
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Balk, A. M. (2014). The Rossby Wave Extra Invariant in the Dynamics of 3-d Fluid Layers and the Generation of Zonal Jets : Volume 21, Issue 1 (10/01/2014). Retrieved from

Description: Department of Mathematics, University of Utah, Salt Lake City, UT 84112, USA. We consider an adiabatic-type (approximate) invariant that was earlier obtained for the quasi-geostrophic equation and the shallow water system; it is an extra invariant, in addition to the standard ones (energy, enstrophy, momentum), and it is based on the Rossby waves. The presence of this invariant implies the energy transfer from small-scale eddies to large-scale zonal jets.

We show that this extra invariant can be extended to the dynamics of a three-dimensional (3-D) fluid layer on the beta plane. Combined with the investigation of other researchers, this 3-D extension implies enhanced generation of zonal jets.

For a general physical system, the presence of an extra invariant (in addition to the energy–momentum and wave action) is extremely rare. We summarize the unique conservation properties of geophysical fluid dynamics (with the beta effect) that allow for the existence of the extra invariant, and argue that its presence in various geophysical systems is a strong indication that the formation of zonal jets is indeed related to the extra invariant.

Also, we develop a new, more direct, way to establish extra invariants (without using cubic corrections). For this, we introduce the small denominator lemma.

The Rossby wave extra invariant in the dynamics of 3-D fluid layers and the generation of zonal jets

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